An easily constructed alkalihyphen;metalhyphen;ion gun with a large metalhyphen;zeolite reservoir is described. The gun provides ionhyphen;beam currents from 100 eV to 5 keV in excess of 10 mgr;A with a wide range of focal lengths. The ion trajectories of the extraction, acceleration, and focusing have been computed using the programsimion. A versatile threehyphen;electrode extraction geometry that provides ion trajectories which emulate the planar diode is described.
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